There's a species of termites that accumulates a certain chemical on their backs throughout their lives. The older ones who have a lot of this chemical compound become guardians of the colony. When the colony is under attack and one of these elder termites dies, the chemical is released and mixed with termite saliva creating an explosion that then releases noxious gas, killing all invaders in the vicinity. That's an animal carrying around the ingredients to make an explosive for an altruistic sacrifice! Spouse showed this to me reported in the Helsinki Sanomat, so I found a link to share with the rest of you (https://www.nature.com/news/termites-ex ... es-1.11074).